Meaning of “leave well alone” in the English Dictionary

british dictionary

"leave well alone" in British English

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leave well alone

to allow something to stay as it is because doing more might make things worse:

It's going to get in a muddle if you carry on. I should just leave well alone if I were you.

(Definition of “leave well alone” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)